SHAREHOLDERS' EQUITY (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Changes in shareholder's equity
Beginning balance	$ 1,048,157
Net earnings common stockholders	14,727	$ 11,524
Ending balance	1,066,398	1,015,277
Common stock
Changes in shareholder's equity
Beginning balance	307	307
Ending balance	307	307
Additional paid-in-capital
Changes in shareholder's equity
Beginning balance	301,553	297,644
Stock plans	(856)	(1,367)
Ending balance	300,697	296,277
Retained earnings
Changes in shareholder's equity
Beginning balance	905,022	830,989
Net earnings common stockholders	14,727	11,524
Dividends paid	(2,067)	(2,079)
Ending balance	917,682	840,434
Accumulated other comprehensive income (loss)
Changes in shareholder's equity
Beginning balance	(31,764)	(2,161)
Foreign currency translation	11,513	(2,500)
Ending balance	(20,251)	(4,661)
Treasury stock
Changes in shareholder's equity
Beginning balance	(126,961)	(107,083)
Share repurchases	(5,076)	(9,997)
Ending balance	$ (132,037)	$ (117,080)